Junior Subordinated Deferrable Interest Debentures (Details) $ / security in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) quarter $ / security	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Percentage of Trust Preferred Securities eligible as Tier 1 capital	25.00%
Spread on LIBOR	1.60%
Redemption period	90 days
Percentage of notes outstanding required to call payment	25.00%
Number of consecutive quarterly periods of nonpayment required to call notes \| quarter	20
Liquidation value per security \| $ / security	1
Interest rate at period end	2.48%
Interest expense for the period	$ 121	$ 99	$ 96
Service 1st Bank
Debt Instrument [Line Items]
Aggregate Principal Amount Junior Subordinated Notes	$ 5,155

Amount Of Trust Preferred Securities Eligible As Tier One Capital Maximum Percentage

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- Definition

Long Term Debt Terms Redemption Period

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Number Of Consecutive Quarterly Periods Of Nonpayment Required To Call Notes

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- Definition

Percentage Of Aggregate Principal Amount Of Notes Outstanding Required To Call Notes

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- Definition

Trust Preferred Securities Liquidation Value Per Unit

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.8)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 9
-Article 9

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